Die



C. P. HARRISON.

DIE.

APPLICATION FILED MAY24. 191a.

Patented Feb. 24; 1920.

2 SHEETS-SHEET 2 Hill .q\\\4 v on gwmmtoz UNITED STATES PATENT OFFICE.

CHARLES P. HARRISON, OF MILLCREEK TGVYNSHIP, ERIE COUNTY, PENNSYLVANIA, ASSIGNOR TO MODERN TOOL COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

DIE.

Application filed May 24, 1918.

which the following is a specification.

This invention relates to dies and consists 1n certain lmprovements 1n the construction .thereof as will be hereinafter fully describedand pointed out in the claims.

More particularly theinvention relates to that type of die commonly called collapsing dies.

The invention is illustrated in the accompanying drawings as follows Figure 1 shows a front view of the die, a part being broken away to better show con struction.

Fig. 2 a section on the lines 22 in Figs. 1 and f1.

Fig. 3 a section on the line 33 in Fig. 2.

Fig. 4 a section on the line 1-4 in Fig. 2.

Fig. 5 a section on the line 55 in Fig. 2.

Fig. 6 a section on the line 6-6 in Fig. 1.

1 marks the chasers, or cuttersQ As shown these are thread cutters. 2 marks the chaser blocks in which the chaser-s are secured, and 3 screws for securing the chasers in the chaser blocks. The chaser blocks operate in radial slots 4 arranged in the head 5. The blocks have the flanges 6 which operate in the undercut portions 7 of the grooves 4. it will be noted that these radial grooves extend from a central opening 45* and thatthe blocks 2 are of suchlength as to permitlthe blocks being moved from the grooves at into the central opening 1* and removed from the head. I

The blocks have the cam surfaces 8 on their outer ends, the surfaces preferably covering the portion of the blocks immediately outside of the cutters 1. and these cam surfaces engage cam surfaces 9 on a cam ring 10. It will be readilyseen that as the cam ring is rotated the blocks are forced inwardly so as to close the die. The cam ring is held in place on the head by means of a plate 11 secured to the head by'means of the screws 12. s

The chaser blocks 2 and with them the chasers are forced outwardly when the camsv Specification of Letters Patent.

Patented Feb. 24, 1920.

Serial No. 236,295.

are swung so as to relieve them by a spring mechanism as follows: Screws 13 extend through the blocks 2 and through slots 14 connecting the grooves r with sockets 15 in the head. sockets 15 and operate against thescrews 13 Springs 16 are arranged'in the to vieldingly press the blocks 2 outwardly. Inorder that the blocks 2 may be removed in the manner hereinbefore descrlbed it IS necessary that the screws 13 be removed and this permits of the extenslon of the sprlngs 16. In order to re-assemble the parts withouttaking down the other parts of the die it is necessary to have some means provided for compressing the spring 16. To accomplish this the pockets ,15 are arranged to register with openings 17 in the cam ring,

the opening 17 being closed by a block 18.

WVhen the openings 17 are in register with the pockets 15 any small implement may be inserted compressing the spring so as to permit the insertion of the screws 13.

The head is slidingly mounted on the carrier or shank 19. The head is locked against rotation on the carrier by means of pins 20 which project into perforations 21 in the rear of the head. These pins 20 are car ried by a collar 22 which is screwed on the shank, or-carrier, 19 and locked thereon by means of a set screw 22*. In the operation of the die the cams are released at a certain point by axial movement ofthe head 5 0n the carrier 19. T head is yieldingly positioned on the carrier as follows: Screws 23 extend through openings 24 in the head and are screwed intothe shoulder or collar 22. Openings 24 are enlarged at their front ends forming the pockets 25 and at their rear ends forming pockets 26. Springs 27 are arranged between the heads 28 of the screws 23 and the bottoms of the sockets 25 and springs 29 are arranged in-the pockets 26 and tend to hold the heads a slight distance in front of the shoulder or collar 22. It will thus be seen that the head 5 has a limited rearward movement on the carrier '19 compressing the springs 29. The purpose of this is to take care of any slight variation there .may be in the feed incident to the is also provided with a circumferential groove 31 in its rear end face in which are arranged the springs 32 for throwing the cam to open the dies. Posts 33 extend into the groove, these posts extending into sock-- ets 33 in the head. One of the springs engages a pin 34 extending from the camring into the groove 31 and the other of the springs presses against a block 35 which is secured on the cam ring by means of screws 36 and 37. The block 35 forms a stop limiting the'inovement of the ring under the influence of the springs and also limiting the movement of the ring under pressure from the chaser blocks. This stop, therefore, determines the position of the ring and in consequence the adjustment of the chasers.

The stop engagcs a latch 38 The latch is arranged in a socket 39 in a latch ring 40. The latch pin has. a reduced extension forming a shoulder 41 and a spring 41 operating against this shoulder yieldingly presses the latch forward. A reduced portion ofthe latch extends througha circumferential slot 42 in the shoulder 22 and is provided witha nut 43 at its rear end which is adapted to engage the shoulder, or eollar 22, as the ring 40 is carried forward with the head. The front end, or engaged portion,of the latch 38 is rectangular as clearly shown in Fig. 3, one being slightly oblong, one engaging surface being, therefore, a greater vdistance from the axis of the pin than theother. In this manner-by turning the pin one quarter revolution-the position of the cam ring may be slightly varied so as to provide for a roughing cut where the cam ring is so limited as to prevent the complete closure of'the dies and then set for a finishing cut with the surface nearest the axis in ongagement with the block 35. The nut 43 is provided'with a handle44 which is screwed into the nut and against the pin 38. Byswinging this handle 44. a quarter turn as clearly shown in Fig. 3 these different positions of the latch pin may be accomplished.

ring is swung by means of the handle so as to permit the latch 38 to project in front of the block and so look the ring against a return movement under the influence of the springs 32. If a roughing and finishing cut is desired, the position of the latch is as shownin Fig. 3. -The finishing cut may be had by swinging the handle 44 to the position. shown in dotted linesin Fig. .3. The work is then fed for- In the operation of the device the canr ward by a movement of the carrier 19 or by a movement of the work toward'the dies. After it has progressed a certaln distance the feeding movement is stopped and a con tinued rotating movement in the'cutting of the threads moves the die axially on the carrier so as to carry the cam ring and latch ring forward until the nut 43 contacts the collar 22. A further axial move ment of the head and cam ring moves the block 35 out of engagement with the latch 38 and permits the springs 32 to swing the ring to carry the cams 8 with relation to the cams 9 so that the springs 16 can force the die blocks into open position.

With certain classes of work it is. desired to have a lesseroverlap of the latch 38 on the block 35 than with other classes of work, that is, to have the tripping movement of the head more or. less depending on' the class of work. By adjusting the nut this amount of overlap can be controlled desired. The handle 44 forms a. locking meansfor locking the nut 43 in. adjustment, as by backing away the handle from the pin38 the pin may be turned so as to bring it to any adjustment desired and by screwing in the handle the nut may be locked in the adjustment secured. m

The. latch ring. has a slot 47 on its inner periphery and a pin 48 extends into this slot, the pin being secured on the head 5 byie xtendinginto' a: socxet 49v. Screws 50 are arranged tangentially in the ring atoppo sitesidesz of the post, or plug 48. It will be readily seen that'by backing 01f one of the screws .50 and turning up the other, the ring 40'inay be turned on the head aiichthis turning shifts the position of the latch pin 38' and consequently theadjust- 'ment of the cam ring. -It' "will be seen,

bling the parts, particularly by users. By

havingthe cam ringextend 'o'ver'the ends of the chaser blocks the thrust of the dies orchasers is direct uponthe'eams and there is no tendency for the chassis to change their alinement under pressure.

What I claim as new is: T e 1. In a. die, the combination of a carrier;

a head mounted on the carrier; cutters mounted o'n'the head; a cam ring on the head adjusting the cutters; a latch for the ring tripped by axialmovement; and means for adjusting the latch to varyv the movement necessary to disengage the latch.

2. In-adie, the combination of a carrier;

a head mounted on thefcarrier; cutters. mounted'on the head;a cam ring actuating the cutters; a latch pin for lockingthe riiw, said pin being tripped by an axial relative movement of [said ipinand ring; a screw on the pin; and a. stop on the screw for varying the movement necessary to eflect the tripping of the latch.

3. In a die, the combination of a carrier; a head on the carrier; cutters mounted on the head; a cam ring actuating the cutters; a rotative latch pin for locking the cam ring in closed position, said latch pin presenting varying engaging surfaces when rotated to vary the adjustment of the cam ring; a nut on the pin forming an adjustable stop for varying the point of disengagement of the latch; and a handle on the nut for rotating the pin.

'JL. In 'a die, the combination of a carrier; a head on the carrier; cutters mounted on the head; a cam ring actuating the cutters; a rotative latch pin for locking the cam ring in closed position, said latch pin presenting varying engaging surfaces when rotated to vary the adjustment of the cam ring; a nut on the pin forming an adjustable stop for varying the point of disengagement of the latch; and a handle on the nut forrotating the pin; said handle forming a means for locking the nut in adjustment on the pin.

5. In a die, the combination of a carrier; a head on the carrier; cutters mounted on the head; a cam ring actuating the cutters; a rotative latch pin for locking the cam ring in closed position, said latch pin presenting varying-engaging surfaces when rotated to vary the adjustment of the cam ring; a nut on the pin forming an adjustablestop for varying the point of disengagement of the latch; a handle on the nut for rotating the pin; a latch ring in which the latch pin is mounted; and means for adjusting the latch ring.

6. In a die, the'combination of a carrier; a head on the carrier yieldingly mounted to move in either axial direction on the carrier; cutters mounted on the head; a cam ring actuating the cutters mounted on the head; a latch pin for locking the cam ring in adjustment, said latch being disengaged by a relative movement between the ring and latch; and means for adjusting the latch to vary the point of tripping of the latch.

7 In a die, the combination of a carrier; a head on the carrier; cutters mounted on the head; a cam ring actuating the cutters; and a latch pin for locking the cam ring in closed position, said latch pin being rotatively mounted, the latch pin having two central opening into which the holding slots extend; cutters mounted in the slots and removable therefrom into the central opening; and detachable means acting on the cut 'ters to move them radially in the slots in the operation of the die and permitting when detached a direct radial movement of the dies in the slots into the central opening for removal.

9. In a die, the combination of a head having radial holding slots extending from a central opening; cutter blocks mounted in the slots and removable therefrom into and from the central opening; detachable means acting on the blocks to move them radially in the slots in the operation of the die and permitting when detached a direct radial movement of the blocks in the slots into the central opening for removal and cutters secured to the blocks.

10. In a die,-the combination of a head having-radial holding slots therein; cutters mounted in said slots; and springs for pressing thecutters outwardly, said springs being compressible from Without the die independently of the cutters for assembling the cutters in the die relatively to the springs.

11. In a die, the combination of a head having radial slots and radial spring sockets; cutters in the slots having projections extending into the spring sockets; and springs in the sockets operating on said projections to press the cutters outwardly, said sockets having openings extending to the surface of the die to permit the compressing of the spring in assembling the die.

12. In a die, the combination of a head; cutters mounted in the head; a cam ring for actuating the cutters rotatively mounted in the head, the head forming the entire peripheral support of the cam ring and the camring actuating the cutters by engagement with the outer ends of the cutters; a spring acting circumferentially on the cam ring to retract the cam ring; and an automatic release for the cam ring.

13. In a die, the combination of a head; cutters mounted in the head having cams on the ends thereof; a cam ring the cutters having cams operating on the cams at the ends of the cutters, said cam ring being mounted entirely on the head; a spring act ing cipcumferentially on the cam ring for retracting the same; and an automatic release for the cam ring.

it. In a die, the combination of a carrier; a head mounted on the carrier and movable axially thereon; drive pins extending from the carrier into the head; spring bolts extending from the carrier into the head;

springs 0n the spring bolts for yieldingly positioning the heed in two directions relatively to the carrier; cutters on the head;

and means for actuating-and tripping the cutters. V

15'. In a die, the combination of a earner;

' a head mounted on the outer periphery of the carrier and havlng an axial movement I thereon; drive pins extending from the cair- 10 rier into the headgISprings for yieldingly positioning the head-in =tW directions; cutters in the head; and' means for "actuating and tripping thecutters.

" In testlmony whereof I have hereunto set 15 

